ID   CPI2_SOLTU              Reviewed;          25 AA.
AC   P24744;
DT   01-MAR-1992, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-1992, sequence version 1.
DT   03-AUG-2022, entry version 57.
DE   RecName: Full=Cysteine protease inhibitor 2;
DE   AltName: Full=PKI-2;
DE   Flags: Fragment;
OS   Solanum tuberosum (Potato).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Solanoideae; Solaneae; Solanum.
OX   NCBI_TaxID=4113;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   STRAIN=cv. Russet Burbank-0; TISSUE=Tuber;
RX   PubMed=16668362; DOI=10.1104/pp.97.1.15;
RA   Walsh T.A., Twitchell W.P.;
RT   "Two Kunitz-type proteinase inhibitors from potato tubers.";
RL   Plant Physiol. 97:15-18(1991).
CC   -!- FUNCTION: Inhibitor of subtilisin. Inhibits moderately trypsin and
CC       chymotrypsin (serine proteases). May protect the plant by inhibiting
CC       proteases of invading organisms.
CC   -!- TISSUE SPECIFICITY: Cortex of tuber.
CC   -!- SIMILARITY: Belongs to the protease inhibitor I3 (leguminous Kunitz-
CC       type inhibitor) family. {ECO:0000305}.
CC   -!- CAUTION: PubMed:16668362 postulates a moderate inhibition of serine
CC       proteases but the sequence homology points to a cysteine protease
CC       inhibitor. {ECO:0000305}.
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DR   AlphaFoldDB; P24744; -.
DR   STRING; 4113.PGSC0003DMT400026265; -.
DR   PRIDE; P24744; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   GO; GO:0004869; F:cysteine-type endopeptidase inhibitor activity; IEA:UniProtKB-KW.
DR   GO; GO:0004867; F:serine-type endopeptidase inhibitor activity; IEA:UniProtKB-KW.
DR   InterPro; IPR002160; Prot_inh_Kunz-lg.
DR   PROSITE; PS00283; SOYBEAN_KUNITZ; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Protease inhibitor; Reference proteome;
KW   Serine protease inhibitor; Thiol protease inhibitor.
FT   CHAIN           1..>25
FT                   /note="Cysteine protease inhibitor 2"
FT                   /id="PRO_0000083314"
FT   NON_TER         25
SQ   SEQUENCE   25 AA;  2920 MW;  1F5607405921DFDC CRC64;
     LVLPEVYDQD GHPLRIGQRY IINNP